If you want cage fights, you should also include the lean contender: http://nsl.com/k/sudoku/aw3.k

(I'll copy it here, because it's short enough for that:

  p,:3/:_(p:9\:!81)%3
  s:{*(,x)(,/{@[x;y;:;]'&21=x[&|/p[;y]=p]?!10}')/&~x}